PLZ HELP!!>\\< [Maximum mark: 6]
The equation of a line L, is 3.x = 12 - y.
(a) For the line L1, find:
(i) the r-intercept;
(ii) the gradient.
A second line, L2, intersects the r-axis at P(2.0) and is parallel to L.
(b) Find the equation of L2, giving your answer in the form y=mr +c.
(c) Calculate the y-intercept of L2.

The decibel level of sound is 50 db greater on a busy street than in a quiet room where the intensity of sound is watt/m2. the level of sound in the quiet room is db, and the intensity of sound in the busy street is watt/m2. use the formula , where is the sound level in decibels, i is the intensity of sound, and is the smallest sound intensity that can be heard by the human ear (roughly equal to watts/m2).

Need ! discuss how to convert the standard form of the equation of a circle to the general form. 50 points

What is the length of the unknown leg in the right triangle ?